Done with area lamps, a red tinted one behind the black pieces, and a teal/light blue one behind the white. Both angled to the center of the board. The background gradient was done by simply placing the scene inside of an default UV Sphere set to smooth blending.
Eevee: (Screen Space Reflection, Ambient Occlusion, & Bloom turned ON / 512 samples)
Cycles: (Default settings / 300 samples)
